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Full text of "The manufacture and properties of iron and steel"

280
METALLURGY OP IRON" AND STEEL.
of proportionate size, the pieces would be in the rolls about the same length of time, so that the only difference in character will be due to the more rapid loss in heat from a thin bar and from the more thorough compression. In Table XV-F, where all bars were rolled from the same-sized billet, these factors are supplemented by the extra cooling during the longer exposure in the, rolls.
TABLE XV-F.
Effect of Annealing on Bars of Different Thickness, when All Pieces had been Eolled from Billets 3 inches Square.
Heat Number.	Size of Bar in inches.	Ulfc. strength.; Its. per sq. inch.		Elastic limit; Ibs. per sq.. inch.		Elongation in 8 in.; per cent.		Reduction of area; per ct.	
		1 1	i "3 9	a 1	d 3 	3' h a -u &	73 0) "3 V	i 5 	i   . ,-d 'I .a JL 65.6 64.2 67.0 69.6 69.0
4605	:%*.% '2xJ? (2x% 2x3* 2X&	61870 51070 60850 62960 55560	45490 43280 46350 44470 45830	32860 83200 35700 86220 47380	25560 24110 25980	84,50 81.50 82.50 81.25 80.00	86.75 88.00 89.50 38.50 38.25	59.6 59.2 60.8 63.2 53.2	
					27780				
0227	J2x% 2xj| 2xl| 2xi| ,    .2x>l    '	58690 60850 60950 62280 66340	62880 52270 52460 53500 54310	87000 88560 42110 42600 49860	29080 28460 29860 81000 80600	85.00 29.50 80.00 25.75 27.50	82.00 82.00 81.75 80.75 26.25	55.4 58.8 60.0 55.9 56.6	56.4 55.1 56.6 58.4 61.6
1509	1         *378     ' O^rlZ Sxil	65600 67810 67470 69210 72100	61480 64500 62660 65240 66940	40980 48090 44090 47950 54060	87840 41400 40480 44510 49000	29.50 26.25 26.25 26.50 27.75	29.00 29.25 29.25 .  80.50 27.50	50.9 47.1 53.2 64.1 55.0	57.1 ,56.0 56.1 52.6 52,6
1440	0   ' 2xj) 2xfi '     2xi ,!   '2xj|	72440 72570 72950 75620 77500	69780 67980 67860 71560 70820	46440 , 46200 48760 61160 60920	45250 42000 48920 48250 66420	27.50 27.25 26.25 25.00 26.00	24.25 28.25 26.25 26.50 25.50	45.7 47.8 52.1 53.5 46.8	66.3 54.2 65.4 59.0 59.9
SEO. XVd.Effect of annealing on plates of the same charge wfyich showed different physical properties.This matter of finish-, ipg, temperature is of supreme importance in filling specifications om^structjural material, more especially in the rolling of thin plates, for it will often happen that different members of one heat will show1 wide variations in tensile strength when the metal itself is practically homogeneous. Table XV-G- will illustrate this point .By; giving the records of test-pieces which gave the greatest variations Miany.one heat, and comparing the natural bar with a piece f 4ae saime strip when-annealed.